Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d6977c2e0d2544…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 03:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: db0c70b12b4c1a3105520c54d3ec79e4 SHA-1: 16d2ec7ad49faccf377f1159bbec3080b58a9cbc SHA-256: 51d6977c2e0d25446b60560f88e74951f8d9cfe413a9c37ab69f703a59b81a33
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a link farm designed to lure users into clicking on malicious URLs, disguised as book downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=cornerstones+of+cost+management+3rd+edition+pdf In PDF document text
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdfIn PDF document text
    • http://files.fruitageofthefield.com/uploads/1/3/1/0/131071145/borolafed_vumusoxav_kigodusixulome.pdfIn PDF document text
    • http://files.reformanortheast.org/uploads/1/3/1/4/131453450/tokunumanan_vazuduluwig_pevejajip.pdfIn PDF document text
    • http://files.jenaforryaneyoga.com/uploads/1/3/1/6/131606111/5210671.pdfIn PDF document text
    • http://files.tntelitesportsacademy.com/uploads/1/3/1/3/131398006/xolugipasebod-romakobikesakir-kujeputufox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/seveno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/32757134962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/24832765279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/dodogogiwomawufaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/45733527630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/bubemevixozogimozul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/melepozowixadogugiximi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/lezodezolenuvudoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/77919762180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/perububikuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/pokemon_world_map_editor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E39 5512 bytes
SHA-256: b6b9c4f7f57ccaf69dfa0f3867e58c085fa4fbfaa2d5d01978cb5a83266dfd5a
font_01_sfnt_off000080de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 10644 bytes
SHA-256: 769c1e2fe49d1badcd29c74181e7c5862fdd462637aa2430a363e96d6ad272fc

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